Synthesis of highly crystalline hexagonal cesium tungsten bronze nanoparticles by flame-assisted spray pyrolysis

Hirano, Tomoyuki; Nakakura, Shuhei; Rinaldi, Febrigia Ghana; Tanabe, Eishi; Wang, Weining; Ogi, Takashi

doi:10.1016/j.apt.2018.07.001

Cited by 34 publications

(16 citation statements)

References 31 publications

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“…e particles prepared at a carrier gas ow rate of 0.1 m 3 /h are primarily of the submicrometer size. is phenomenon is similar to that in droplet-particle conversion, which produces large particles (not in the nanometer size range) because of precipitation and pyrolysis of precursor droplets in general ame-assisted spray pyrolysis using co ow di usion ames (Hirano et al, 2018). A decrease in Q C to 0.08 m 3 /h leads to a decrease in the proportion of submicrometer particles, and the initiation of nanoparticle formation.…”

Section: E Ects Of Carrier Gas Ow Rate On Particle Propertiesmentioning

confidence: 53%

Sinter-Necked, Mixed Nanoparticles of Metallic Tungsten and Tungsten Oxide Produced in Fuel-Rich Methane/Air Tubular Flames

Hirano

Kikkawa

Shimokuri

et al. 2021

J. Chem. Eng. Japan / JCEJ

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Metallic tungsten nanoparticles have attracted considerable attention because of their unique structures and excellent performances. This paper describes the synthesis of a mixture of tungsten metal and oxide nanoparticles via a fuel-rich tubular ame process, followed by mild-reduction-based post-heating treatment. The high combustion e ciency of the tubular ame process enables complete consumption of O 2 in the premixture, along with the emission of CO and H 2 . The experimental results revealed that the tubular ames produced mixtures of amorphous tungsten oxide and crystalline tungsten nanoparticles with primary particle sizes of 5-10 nm, at a production rate of 4.68 mg/h and yield of 8.64%. These nanoparticles exhibited a sinter-necked structure. The oxygen content of the tubular-ame-synthesized mixtures of tungsten metal and oxide nanoparticles (16.80%) to 5.56% after the additional post-heating treatment, which also retained the particle size.

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Section: E Ects Of Carrier Gas Ow Rate On Particle Propertiesmentioning

confidence: 53%

Sinter-Necked, Mixed Nanoparticles of Metallic Tungsten and Tungsten Oxide Produced in Fuel-Rich Methane/Air Tubular Flames

Hirano

Kikkawa

Shimokuri

et al. 2021

J. Chem. Eng. Japan / JCEJ

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“…Recently Hirano et al reported a method using flame-assisted spray pyrolysis with a reducing gas atmosphere that yields high crystallinity pure hexagonal cesium tungsten bronze ($ ".& '( & ) nanoparticles which act as near-infrared shield in solar control windows to reduce energy consumption of air-conditioning [32]. Their method showed noteworthy near-infrared shielding ability with a 97.7% cut-off at 1500nm.…”

Section: Research In Progressmentioning

confidence: 99%

Plasmonic Effects in Noble Metal-liquid Metal Based Nanoparticles

Bhardwaj¹,

Verma²

2019

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In the era of flexible and foldable devices, liquid metals emerge as a champion because they are being liquid at or near room temperature in addition to having high electrical and thermal conductivities. Plasmonic resonance occurs when conduction band electrons on metal nanoparticle surface collectively oscillates with same frequency as that irradiated light. This plasmonic resonance has attracted great attention because of large electromagnetic field enhancements near metal nanoparticle and the regulating resonance wavelength with change in material, size, shape and surrounding medium of metallic nanoparticle. Incorporation of liquid metal nanoparticles in plasmonics provides unique properties towards sensing (heart rate monitors etc.) which can become wearable. So, developing liquid metal based low-cost and large-scale plasmonic nanostructures may provide more optical efficiencies, fast kinetics, low temperature processing, versatility, easy embedding in structures and stretchy devices. Present work focuses on literature review highlighting the study of optical properties (absorption and scattering efficiencies, LSPR tunability, Figure of Merit (FOM) and Refractive Index Sensitivity (RIS)) of noble metal-liquid metal nanostructures and future scope of the field. Simulations can be performed on the basis of Mie Theory for spherical nanoparticles and by DDA/FDTD method for non-spherical particles or arrays. The results can help to optimize the plasmonic nanostructures of suitable material, size and shape according to the need of application in particular region of EM spectrum.

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“…Our previous studies 4, [14][15][16][17][18][19][20][21][22][23][24][25] reported the methods for preparing submicron particles with controllable particle outer diameters and crystallinities. Here, the purpose of this study was to demonstrate the synthesis route for the preparation of spherical submicron yttrium aluminum garnet (YAG):Ce particles with controllable particle outer diameters and crystallite sizes using a ame-assisted spray-pyrolysis method followed by the annealing process.…”

Section: Introductionmentioning

confidence: 99%

“…To against the above limitations, spray pyrolysis is one of the excellent methods. 17,38 The produced particles are uniform in particle outer diameter, agglomerationfree product, and spherical-shaped particles. 21 The spray pyrolysis is a rapid process, and the reaction occurs in the micron scales, which takes place in small droplets, allowing the produced particles in submicron to micrometer range.…”

Section: Introductionmentioning

confidence: 99%

Spherical submicron YAG:Ce particles with controllable particle outer diameters and crystallite sizes and their photoluminescence properties

et al. 2021

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Synthesis of highly crystalline hexagonal cesium tungsten bronze nanoparticles by flame-assisted spray pyrolysis

Cited by 34 publications

References 31 publications

Sinter-Necked, Mixed Nanoparticles of Metallic Tungsten and Tungsten Oxide Produced in Fuel-Rich Methane/Air Tubular Flames

Sinter-Necked, Mixed Nanoparticles of Metallic Tungsten and Tungsten Oxide Produced in Fuel-Rich Methane/Air Tubular Flames

Plasmonic Effects in Noble Metal-liquid Metal Based Nanoparticles

Spherical submicron YAG:Ce particles with controllable particle outer diameters and crystallite sizes and their photoluminescence properties

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